APPLICATION OF FILTER SHARPENING TO CASCADED INTEGRATOR-COMB DECIMATION FILTERS PDF

Owing to their reduced computational complexity, research on comb filters to date has been focused on 1 improving the magnitude characteristic, 2 preserving linearity of phase, and 3 having the least possible increase of computational complexity [ 2 — 24 ]. With this background, let us review the literature in these three categories. From the representative sample of works improving the magnitude characteristics of comb filters, we observe that the rotated-comb-based schemes [ 2 — 7 ] have the disadvantage of being susceptible to imperfect pole-zero cancelation. An effective way to prevent this problem consists in designing nonrecursive filters [ 3 , 4 , 7 ] with filtering implemented in polyphase form for ensuring power savings.

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Mikalar Optimal Sharpening of Compensated Comb Decimation Filters: Analysis and Design In this case, the proposed sharpened decimation filter has shown a little improvement in pass-band droop and stop-band alias rejection as compared to existing conventional CIC filter [2] and modified sharpened CIC filter [11].

Obtain the sharpening coefficients p k using The optimization problem in 18 is a constrained mixed integer linear programming MILP problem whose solution can be obtained with generic MILP solvers. Please review our privacy policy. The simulation results and their comparison shows that the proposed decimation filter has improved pass-band droop and better stop-band alias rejection than the existing structures.

Proposed CIC-like structure for decimation filtering with sharpened compensated comb filters. Topics Discussed in This Paper. Understanding Digital Signal Processing. A new modified comb-rotated sinc RS decimator with improved magnitude response. A high speed digital decimation filter with parallel cascaded integrator-comb pre-filters.

The proposed filter, on the other hand, achieves better passband droop correction, which meets the 0. Application of filter sharpening to cascaded integrator-comb decimation filters National Center for Biotechnology InformationU. Further the reduction of sampling rate at each stage provides many additional benefits like better power efficiency, reduced hardware requirements, reduced cost and better speed.

Here,Fsisinput sampling frequency rate. High-speed sharpening of decimating CIC filter. In integrator-combb case, the proposed sharpened decimation filter has shown much improvement in pass-band droop and a little improvement in stop-band alias rejection as compared to existing conventional CIC filter [2] and modified sharpened Apppication filter [11].

As a consequence, its complexity is higher, despite the use of compensators in the latter. Various filgers techniques have been proposed to improve the frequency response of CIC filter [].

The main motive of this paper is to design a Sharpened decimation filter based on sharpening technique [12] with all the integrated advantages of existing scheme in order to achieve the better frequency response in pass-band as well as stop-band as compared to existing CIC structures for decimation. There was a problem providing the content you requested For comparison purposes, we present the computational complexity of a sharpening structure for comb filters without compensation structure from [ 18 ]which is given as.

Modified comb filter structure for decimation. In this case, the proposed sharpened decimation filter has shown a much better improvement in pass-band droop and a little improvement in stop-band alias rejection as compared to existing conventional CIC filter [2] and modified sharpened CIC filter [11].

Section 3 presents a summary of the generalized perspective of sharpening comb-based filters for decimation. Thus CIC filters are best suitable for the applications which aim at low power consumption, low cost and lower hardware complexity, but its pass-band is not flat which is its major disadvantage.

Received Aug 31; Accepted Oct The sharpened second and third stage leads to improvement in pass-band droop and better stop-band alias rejection. Open in a separate window. Application of filter sharpening to cascaded integrator-comb decimation filters. Note that K must be an even value to avoid fractional delays. Sharpened compensated comb filters [ ] based on tl simplest polynomial of the traditional Kaiser-Hamming sharpening from [ 27 ] provide a good passband improvement over conventional comb filters.

Mitra [] [11] proposed several schemes for designing sharpened CIC filter for decimation. However, in methods [ ] the filter designer does not have control on the exact passband deviation and stopband attenuation achieved by the designed filter. From the previous analysis, we derive the following two important observations. In proposed sharpened structure, the first stage is with decimation factor M1 can be realized in conventional recursive or non-recursive scheme.

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APPLICATION OF FILTER SHARPENING TO CASCADED INTEGRATOR-COMB DECIMATION FILTERS PDF

Gardahn However, in methods [ zharpening the filter designer does not have control on the exact passband deviation and stopband attenuation achieved by the designed filter. On the polyphase decomposition for design of generalized comb decimation filters. The main motive of this paper is to design a Sharpened decimation filter based on sharpening technique [12] with all the integrated wharpening of existing scheme in order to achieve the integrattor-comb frequency response in pass-band as well as stop-band as compared to existing CIC structures for decimation. Thus CIC filters are best suitable for the applications which aim at low power consumption, low cost and lower hardware complexity, but its pass-band is not flat which is its major disadvantage. Nine digital filters for decimation and interpolation. Thus, a different sharpening approach has to be pursued.

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Application of filter sharpening to cascaded integrator-comb decimation filters

Dizil Proposed Sharpened Compensated Comb Filters Let us consider as subfilter the simplest compensated comb filter, which has the following transfer function [ 11 ]: Obviously, this is a preliminary estimation that depends on the accuracy of the formula being used. This paper proposed an optimization framework to design sharpening polynomials specifically suited to comb-based decimation filtering. Saramaki T, Ritoniemi T. An economical class of digital filters for decimation and interpolation. However, we must have monotonic magnitude characteristic over the passband region of the filter to be sharpened.

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Optimal Sharpening of Compensated Comb Decimation Filters: Analysis and Design

Durai Saravanan, V. Jayaprakasan " This paper presents a double sharpened CIC decimation filter, which consists of generalized comb filter as first stage, sharpened comb filter as second and third stage. The comb decimation filter at the first stage operates at the input sampling rate, sharpened second stage operates at lower samplin

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